Hi There, I Compete In Boxing And Have Hurt A

Hi there,
I compete in boxing and have hurt a knuckle. Last Tuesday at practice I was sparring and woke up on the Wednesday with a very sore knuckle... This progressed to a very swollen hand and a great amount of pain. The swelling is now minimal however the pain is still there and I am feeling a weird creaking sensation when forming a fist or bending the finger.
Many thanks
Josh